A Novel Approach for Fabrication of Functional Carbon–Ceramic Composites with High Resistance to Gas Plasma Treatment
摘要
This work is aimed to develop a technology for fabrication of high-temperature carbon–ceramic composite materials. The approach includes the following processing stages: the fabrication of filled carbon-fiber blanks, their subsequent carbonization, high-temperature heat treatment, and pyrolytic compaction. A distinctive feature of the technology is the impregnation of particles of refractory component precursors into the interlayer space, that ensures in situ synthesis and subsequent sintering of the ceramic component of the matrix during the carbonization and high-temperature heat treatment stages. This approach has been successfully tested in the fabrication of carbon–ceramic composites in the Cf/C system—carbides and borides of transition metals of IV (Hf, Ti) and V (Nb) groups. The results of gas-dynamic tests of samples of the resulting composites under the influence of high-speed, high-enthalpy flows of oxidizing gases are presented. It is noted that the number of functional layers and their thickness allow to regulate the magnitude of the thermal load by changing the rate of oxidation, ablation and the duration of each mode.